Tomotherapy dose distribution verification using MAGIC-f polymer gel dosimetry


Autoria(s): Pavoni, J. F.; Pike, T. L.; Snow, J.; DeWerd, L.; Filho, Oswaldo Baffa
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

24/10/2013

24/10/2013

2012

Resumo

Purpose: This paper presents the application of MAGIC-f gel in a three-dimensional dose distribution measurement and its ability to accurately measure the dose distribution from a tomotherapy unit. Methods: A prostate intensity-modulated radiation therapy (IMRT) irradiation was simulated in the gel phantom and the treatment was delivered by a TomoTherapy equipment. Dose distribution was evaluated by the R2 distribution measured in magnetic resonance imaging. Results: A high similarity was found by overlapping of isodoses of the dose distribution measured with the gel and expected by the treatment planning system (TPS). Another analysis was done by comparing the relative absorbed dose profiles in the measured and in the expected dose distributions extracted along indicated lines of the volume and the results were also in agreement. The gamma index analysis was also applied to the data and a high pass rate was achieved (88.4% for analysis using 3%/3 mm and of 96.5% using 4%/4 mm). The real three-dimensional analysis compared the dose-volume histograms measured for the planning volumes and expected by the treatment planning, being the results also in good agreement by the overlapping of the curves. Conclusions: These results show that MAGIC-f gel is a promise for tridimensional dose distribution measurements. (C) 2012 American Association of Physicists in Medicine. [http://dx.doi.org/10.1118/1.4704496]

Identificador

MEDICAL PHYSICS, MELVILLE, v. 39, n. 5, supl. 1, Part 6, pp. 2877-2884, MAY, 2012

0094-2405

http://www.producao.usp.br/handle/BDPI/35998

10.1118/1.4704496

http://dx.doi.org/10.1118/1.4704496

Idioma(s)

eng

Publicador

AMER ASSOC PHYSICISTS MEDICINE AMER INST PHYSICS

MELVILLE

Relação

MEDICAL PHYSICS

Direitos

closedAccess

Copyright AMER ASSOC PHYSICISTS MEDICINE AMER INST PHYSICS

Palavras-Chave #TOMOTHERAPY #GEL DOSIMETRY #MAGIC #THREE-DIMENSIONAL DOSIMETRY #MRI #RELAXOMETRY #MRI RADIATION-DOSIMETRY #ARC THERAPY IMAT #CONFORMAL RADIOTHERAPY #DELIVERY #VALIDATION #RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Tipo

article

original article

publishedVersion